Mass Extinction And The Structure Of The Milky Way

View previous topic View next topic Go down

Mass Extinction And The Structure Of The Milky Way

Post by skfarblum on September 22nd 2013, 2:36 am

A summary of a paper
http://xxx.lanl.gov/pdf/1309.4838v1

Mass Extinction And The Structure Of The Milky Way
M. D. Filipović, J. Horner, E. J. Crawford, N. F. H. Tothill
(Submitted on 19 Sep 2013)
We use the most up to date Milky Way model and solar orbit data in order to test the hypothesis that the Sun's galactic spiral arm crossings cause mass extinction events on Earth. To do this, we created a new model of the Milky Way's spiral arms by combining a large quantity of data from several surveys. We then combined this model with a recently derived solution for the solar orbit to determine the timing of the Sun's historical passages through the Galaxy's spiral arms. Our new model was designed with a symmetrical appearance, with the major alteration being the addition of a spur at the far side of the Galaxy. A correlation was found between the times at which the Sun crosses the spiral arms and six known mass extinction events. Furthermore, we identify five additional historical mass extinction events that might be explained by the motion of the Sun around our Galaxy. These five additional significant drops in marine genera that we find include significant reductions in diversity at 415, 322, 300, 145 and 33 Myr ago. Our simulations indicate that the Sun has spent ~60% of its time passing through our Galaxy's various spiral arms. Also, we briefly discuss and combine previous work on the Galactic Habitable Zone with the new Milky Way model.
avatar
skfarblum
Member
Member

Male
Number of posts : 127
Age : 73
Location : Kfar blum
Hobbies : Walking,reading,meditation,open source
Tell us about yourself : Serious minded.Dry sense of humour.Very emotional.
Appreciation Points : 201
Registration date : 2013-08-22

View user profile

Back to top Go down

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum